Insulator cap



J. C.- KORTICK INSULATOR GAP Aug. 21, 1934.

Original Filed July 15. 1951 INVENTOR. 4/011 Cffazrzczr A TTORNEYS.

Patented Aug. 21, 1934 UNITED STATES INSULATOR CAP John C. Kortick, San Francisco, Calif.

Original application July 13, 1931, Serial No. 550,548. Divided and this application July 2,

1932, Serial No. 620,673

1 Claim.

My invention relates to improvements in insulator caps, and it consists of the combinations, constructions and arrangements hereinafter described and claimed.

This application is a, division of an application on a method of making insulator caps, Serial No. 550,548, filed July 13, 1931. In said application, I illustrated the method of making the insulator cap and have claimed the method. In

0 the present invention, I have illustrated the insulator cap and am claiming the article.

An object of my invention is to provide an insulator cap in which the cap is formed of two pieces comprising a bell and a head. The head is securable to the bell and may be welded in place or otherwise secured for forming a permanent part of the cap.

By forming the insulator cap in two pieces, it permits the device to be manufactured by dropforging and metal stamping and drawing process rather than by casting, and the resulting article is much stronger than a casting for the same amount of material used. Still a further advantage lies in the fact that the heads are provided with flanges that bear against the under surface of the bell top and thereby support the bell just as effectively as if the head were an integral part with the bell.

Other objects and advantages will appear in the following specification, and the novel features of the device will be particularly pointed out in the appended claim.

My invention is illustrated in the accompanying drawing forming a part of this application,

in which Figure 1 is a vertical section through the insulator cap;

Figure 2 is a top plan view;

Figure 3 is an elevation of the head when looking at Figure 1 from the left.

In carrying out my invention, I provide a bellshaped member 1 having a conical wall 2 with a rounded portion 3 and an inwardly-extending rim 4. The metal adjacent to the rim is thicker than the rest of the bell wall or top. The upper end of the bell is rounded as at 5 and has an inwardly-extending flange 6 defining an opening 7.

A dome-shaped head, indicated generally at 8 in Figures 1, 2 and 3, is disposed in the bell 1 so that a portion is received in the bell, while another portion projects above the bell.

The head 8 has a base portion 9 designed to be snugly received in the opening '7, and a flange 10 that is integral with the base and extends beneath the flange 6. The base has an opening 11 which 00 of the bell flange when the cap is inserted.

The head has a dome-shaped portion 13 providing a recess 14 for receiving the head 15 of a supporting pin 16. The dome 13 has a slot 1'7 for receiving the shank of the pin 16, and the slot is'enlarged at 18 for receiving the head 15. The dome 13 also has an opening 19 for receiving a cotter pin 20. The cotter pin lies upon the top of the plug 12 and prevents the head 15 from moving downwardly into alignment with the enlarged opening 18. In this way, the supporting pin 16 is prevented from accidental withdrawal from the head 8. It will be noted that when the cotter pin is removed, the pin 16 and head 15 may be removed from the dome 13 without swinging either the pin 16 or the bell 1 into angular positions with respect to each other.

The manufacturer can have a number of bells on hand and can also have a number of heads 8. As the orders come in, the required heads can be secured to the bells by welding or other suitable fastening means. The flanges 10 act as additional supports in carrying the bells l, and positively prevent the separation of the heads from the bells even though the two become loose.

The making of the insulator caps in two pieces permits the tops or heads to be drop-forged and the bells made by metal stamping and drawing process. This results in a far stronger construction. The insulator caps can be manufactured with less expense because of this arrangement of construction because machine work is eliminated.

While I have shown only the preferred form of my invention, it should be understood that various changes or modifications may be made within the scope of the appended claim without departing from the spirit of the invention.

I claim:

An insulator cap comprising a bell having a flat top and an opening in the top so as to leave a flat inwardly projecting marginal flange, a head having a cylindrical base fitting in said opening, a dome having means for fastening a supporting element thereto and a horizontal flange underneath the base and engageable with the bottom face of the bell flange, the former flange being formed integrally with the base and the dome of the head and having a fiat bottom and a tapered inner edge and a tapered cap for the latter edge reinforcing the head against collapsing the cap including a top section lying in the plane of the bell flange when the cap is inserted.

JOHN C. KORTICK. 

